Redding may seem like an unusual place for a world-famous architect to come for a project, but the Sundial Bridge in north-central California is worth a visit.

It is possible to walk underneath both ends of the pedestrian bridge.

The Sundial Bridge is a functional sundial.

The tower of Sundial Bridge as seen from the side.

Looking straight up into the hollow tower of the bridge.

A view from the base of the tower of Sundial Bridge.

An aerial view of the Sundial Bridge on the day of its grand opening, July 4, 2004.

The Sundial Bridge links the north and south campuses of Turtle Bay Exploration Park and serves as a new downtown entrance for Redding's extensive Sacramento River Trail system.

Santiago Calatrava's Sundial Bridge in Redding, Calif., seen at night on July 23, 2005.

As seen at night in Redding, Calif. on July 23, 2005, the illumination of the Sundial Bridge gives it an eerie glow that is reflected on the surface of the Sacramento River.